regress/roff/nr/incr.in

   1 .\" $OpenBSD: incr.in,v 1.1 2018/04/10 00:52:21 schwarze Exp $
   2 .TH NR-INCR 1 "April 10, 2018"
   3 .SH NAME
   4 nr-incr \- increment a number register by accessing it
   5 .SH DESCRIPTION
   6 .nr myr 0 1
   7 Roff can count by merely accessing a number register:
   8 \n+[myr]
   9 \n+[myr]
  10 \n+[myr]
  11 .PP
  12 .nr myr +0 1+1
  13 It can also change the step size:
  14 \n+[myr]
  15 \n+[myr]
  16 \n+[myr]
  17 .PP
  18 .nr myr +0 3
  19 It can also count down:
  20 \n-[myr]
  21 \n-[myr]
  22 \n-[myr]
  23 \n-[myr]
  24 .PP
  25 .nr myr -0 -2
  26 Down in negative steps is up:
  27 \n-[myr]
  28 \n-[myr]
  29 \n-[myr]
  30 \n-[myr]
  31 .PP
  32 .nr myr 42
  33 Go to some other value,
  34 then continue incrementing with an unchanged (negative) step size:
  35 \n+[myr]
  36 \n+[myr]
  37 \n+[myr]